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Message-ID: <575938DE.5080100@osg.samsung.com>
Date: Thu, 09 Jun 2016 10:37:34 +0100
From: Luis de Bethencourt <luisbg@....samsung.com>
To: Laurence Oberman <loberman@...hat.com>
CC: linux-kernel@...r.kernel.org, hare@...e.com,
jejb@...ux.vnet.ibm.com,
martin petersen <martin.petersen@...cle.com>,
linux-scsi@...r.kernel.org, javier@....samsung.com
Subject: Re: [PATCH] aic7xxx: fix wrong return values
On 09/06/16 02:04, Laurence Oberman wrote:
>
>
> ----- Original Message -----
>> From: "Luis de Bethencourt" <luisbg@....samsung.com>
>> To: linux-kernel@...r.kernel.org
>> Cc: hare@...e.com, jejb@...ux.vnet.ibm.com, "martin petersen" <martin.petersen@...cle.com>,
>> linux-scsi@...r.kernel.org, javier@....samsung.com, "Luis de Bethencourt" <luisbg@....samsung.com>
>> Sent: Wednesday, June 8, 2016 6:23:02 PM
>> Subject: [PATCH] aic7xxx: fix wrong return values
>>
>> Convention of error codes says to return them as negative values.
>>
>> Signed-off-by: Luis de Bethencourt <luisbg@....samsung.com>
>> ---
>> drivers/scsi/aic7xxx/aic7770_osm.c | 6 +++---
>> drivers/scsi/aic7xxx/aic79xx_core.c | 24 ++++++++++++------------
>> drivers/scsi/aic7xxx/aic79xx_osm.c | 8 ++++----
>> drivers/scsi/aic7xxx/aic79xx_osm_pci.c | 16 ++++++++--------
>> drivers/scsi/aic7xxx/aic79xx_pci.c | 2 +-
>> drivers/scsi/aic7xxx/aic7xxx_core.c | 26 +++++++++++++-------------
>> drivers/scsi/aic7xxx/aic7xxx_osm.c | 8 ++++----
>> drivers/scsi/aic7xxx/aic7xxx_osm_pci.c | 12 ++++++------
>> drivers/scsi/aic7xxx/aic7xxx_pci.c | 4 ++--
>> 9 files changed, 53 insertions(+), 53 deletions(-)
>>
>> diff --git a/drivers/scsi/aic7xxx/aic7770_osm.c
>> b/drivers/scsi/aic7xxx/aic7770_osm.c
>> index 3d401d0..50f030d 100644
>> --- a/drivers/scsi/aic7xxx/aic7770_osm.c
>> +++ b/drivers/scsi/aic7xxx/aic7770_osm.c
>> @@ -51,7 +51,7 @@ aic7770_map_registers(struct ahc_softc *ahc, u_int port)
>> * Lock out other contenders for our i/o space.
>> */
>> if (!request_region(port, AHC_EISA_IOSIZE, "aic7xxx"))
>> - return (ENOMEM);
>> + return -ENOMEM;
>> ahc->tag = BUS_SPACE_PIO;
>> ahc->bsh.ioport = port;
>> return (0);
>> @@ -87,10 +87,10 @@ aic7770_probe(struct device *dev)
>> sprintf(buf, "ahc_eisa:%d", eisaBase >> 12);
>> name = kstrdup(buf, GFP_ATOMIC);
>> if (name == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>> ahc = ahc_alloc(&aic7xxx_driver_template, name);
>> if (ahc == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>> error = aic7770_config(ahc, aic7770_ident_table + edev->id.driver_data,
>> eisaBase);
>> if (error != 0) {
>> diff --git a/drivers/scsi/aic7xxx/aic79xx_core.c
>> b/drivers/scsi/aic7xxx/aic79xx_core.c
>> index 109e2c9..bf850d8 100644
>> --- a/drivers/scsi/aic7xxx/aic79xx_core.c
>> +++ b/drivers/scsi/aic7xxx/aic79xx_core.c
>> @@ -6422,7 +6422,7 @@ ahd_init_scbdata(struct ahd_softc *ahd)
>> scb_data->maxhscbs = ahd_probe_scbs(ahd);
>> if (scb_data->maxhscbs == 0) {
>> printk("%s: No SCB space found\n", ahd_name(ahd));
>> - return (ENXIO);
>> + return -ENXIO;
>> }
>>
>> ahd_initialize_hscbs(ahd);
>> @@ -6501,7 +6501,7 @@ ahd_init_scbdata(struct ahd_softc *ahd)
>>
>> error_exit:
>>
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> static struct scb *
>> @@ -7076,7 +7076,7 @@ ahd_init(struct ahd_softc *ahd)
>> ahd->stack_size = ahd_probe_stack_size(ahd);
>> ahd->saved_stack = kmalloc(ahd->stack_size * sizeof(uint16_t), GFP_ATOMIC);
>> if (ahd->saved_stack == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> /*
>> * Verify that the compiler hasn't over-aggressively
>> @@ -7115,7 +7115,7 @@ ahd_init(struct ahd_softc *ahd)
>> /*maxsegsz*/AHD_MAXTRANSFER_SIZE,
>> /*flags*/BUS_DMA_ALLOCNOW,
>> &ahd->buffer_dmat) != 0) {
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>> #endif
>>
>> @@ -7143,7 +7143,7 @@ ahd_init(struct ahd_softc *ahd)
>> /*nsegments*/1,
>> /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
>> /*flags*/0, &ahd->shared_data_dmat) != 0) {
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> ahd->init_level++;
>> @@ -7153,7 +7153,7 @@ ahd_init(struct ahd_softc *ahd)
>> (void **)&ahd->shared_data_map.vaddr,
>> BUS_DMA_NOWAIT,
>> &ahd->shared_data_map.dmamap) != 0) {
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> ahd->init_level++;
>> @@ -7194,7 +7194,7 @@ ahd_init(struct ahd_softc *ahd)
>>
>> /* Allocate SCB data now that buffer_dmat is initialized */
>> if (ahd_init_scbdata(ahd) != 0)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> if ((ahd->flags & AHD_INITIATORROLE) == 0)
>> ahd->flags &= ~AHD_RESET_BUS_A;
>> @@ -7644,7 +7644,7 @@ ahd_default_config(struct ahd_softc *ahd)
>> if (ahd_alloc_tstate(ahd, ahd->our_id, 'A') == NULL) {
>> printk("%s: unable to allocate ahd_tmode_tstate. "
>> "Failing attach\n", ahd_name(ahd));
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> for (targ = 0; targ < AHD_NUM_TARGETS; targ++) {
>> @@ -7723,7 +7723,7 @@ ahd_parse_cfgdata(struct ahd_softc *ahd, struct
>> seeprom_config *sc)
>> if (ahd_alloc_tstate(ahd, ahd->our_id, 'A') == NULL) {
>> printk("%s: unable to allocate ahd_tmode_tstate. "
>> "Failing attach\n", ahd_name(ahd));
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> for (targ = 0; targ < max_targ; targ++) {
>> @@ -7967,7 +7967,7 @@ ahd_suspend(struct ahd_softc *ahd)
>>
>> if (LIST_FIRST(&ahd->pending_scbs) != NULL) {
>> ahd_unpause(ahd);
>> - return (EBUSY);
>> + return -EBUSY;
>> }
>> ahd_shutdown(ahd);
>> return (0);
>> @@ -10126,7 +10126,7 @@ ahd_wait_seeprom(struct ahd_softc *ahd)
>> ahd_delay(5);
>>
>> if (cnt == 0)
>> - return (ETIMEDOUT);
>> + return -ETIMEDOUT;
>> return (0);
>> }
>>
>> @@ -10227,7 +10227,7 @@ ahd_wait_flexport(struct ahd_softc *ahd)
>> ahd_delay(5);
>>
>> if (cnt == 0)
>> - return (ETIMEDOUT);
>> + return -ETIMEDOUT;
>> return (0);
>> }
>>
>> diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c
>> b/drivers/scsi/aic7xxx/aic79xx_osm.c
>> index 2588b8f..1dc4977 100644
>> --- a/drivers/scsi/aic7xxx/aic79xx_osm.c
>> +++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
>> @@ -940,7 +940,7 @@ ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t
>> parent,
>>
>> dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
>> if (dmat == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> /*
>> * Linux is very simplistic about DMA memory. For now don't
>> @@ -969,7 +969,7 @@ ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t
>> dmat, void** vaddr,
>> *vaddr = pci_alloc_consistent(ahd->dev_softc,
>> dmat->maxsize, mapp);
>> if (*vaddr == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>> return(0);
>> }
>>
>> @@ -1232,7 +1232,7 @@ ahd_linux_register_host(struct ahd_softc *ahd, struct
>> scsi_host_template *templa
>> template->name = ahd->description;
>> host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
>> if (host == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> *((struct ahd_softc **)host->hostdata) = ahd;
>> ahd->platform_data->host = host;
>> @@ -1327,7 +1327,7 @@ ahd_platform_alloc(struct ahd_softc *ahd, void
>> *platform_arg)
>> ahd->platform_data =
>> kzalloc(sizeof(struct ahd_platform_data), GFP_ATOMIC);
>> if (ahd->platform_data == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>> ahd->platform_data->irq = AHD_LINUX_NOIRQ;
>> ahd_lockinit(ahd);
>> ahd->seltime = (aic79xx_seltime & 0x3) << 4;
>> diff --git a/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
>> b/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
>> index 8466aa7..db58ad9 100644
>> --- a/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
>> +++ b/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
>> @@ -259,12 +259,12 @@ ahd_linux_pci_reserve_io_regions(struct ahd_softc *ahd,
>> resource_size_t *base,
>> */
>> *base2 = pci_resource_start(ahd->dev_softc, 3);
>> if (*base == 0 || *base2 == 0)
>> - return (ENOMEM);
>> + return -ENOMEM;
>> if (!request_region(*base, 256, "aic79xx"))
>> - return (ENOMEM);
>> + return -ENOMEM;
>> if (!request_region(*base2, 256, "aic79xx")) {
>> release_region(*base, 256);
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>> return (0);
>> }
>> @@ -280,10 +280,10 @@ ahd_linux_pci_reserve_mem_region(struct ahd_softc *ahd,
>> int error = 0;
>>
>> if (aic79xx_allow_memio == 0)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> if ((ahd->bugs & AHD_PCIX_MMAPIO_BUG) != 0)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> start = pci_resource_start(ahd->dev_softc, 1);
>> base_page = start & PAGE_MASK;
>> @@ -291,17 +291,17 @@ ahd_linux_pci_reserve_mem_region(struct ahd_softc *ahd,
>> if (start != 0) {
>> *bus_addr = start;
>> if (!request_mem_region(start, 0x1000, "aic79xx"))
>> - error = ENOMEM;
>> + error = -ENOMEM;
>> if (!error) {
>> *maddr = ioremap_nocache(base_page, base_offset + 512);
>> if (*maddr == NULL) {
>> - error = ENOMEM;
>> + error = -ENOMEM;
>> release_mem_region(start, 0x1000);
>> } else
>> *maddr += base_offset;
>> }
>> } else
>> - error = ENOMEM;
>> + error = -ENOMEM;
>> return (error);
>> }
>>
>> diff --git a/drivers/scsi/aic7xxx/aic79xx_pci.c
>> b/drivers/scsi/aic7xxx/aic79xx_pci.c
>> index cc9bd26..d597dc9 100644
>> --- a/drivers/scsi/aic7xxx/aic79xx_pci.c
>> +++ b/drivers/scsi/aic7xxx/aic79xx_pci.c
>> @@ -360,7 +360,7 @@ ahd_pci_config(struct ahd_softc *ahd, const struct
>> ahd_pci_identity *entry)
>>
>> error = ahd_reset(ahd, /*reinit*/FALSE);
>> if (error != 0)
>> - return (ENXIO);
>> + return -ENXIO;
>>
>> ahd->pci_cachesize =
>> ahd_pci_read_config(ahd->dev_softc, CSIZE_LATTIME,
>> diff --git a/drivers/scsi/aic7xxx/aic7xxx_core.c
>> b/drivers/scsi/aic7xxx/aic7xxx_core.c
>> index 64ab9ea..a08179d 100644
>> --- a/drivers/scsi/aic7xxx/aic7xxx_core.c
>> +++ b/drivers/scsi/aic7xxx/aic7xxx_core.c
>> @@ -4466,7 +4466,7 @@ ahc_softc_init(struct ahc_softc *ahc)
>> if (ahc->scb_data == NULL) {
>> ahc->scb_data = kzalloc(sizeof(*ahc->scb_data), GFP_ATOMIC);
>> if (ahc->scb_data == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> return (0);
>> @@ -4782,14 +4782,14 @@ ahc_init_scbdata(struct ahc_softc *ahc)
>> scb_data->scbarray = kzalloc(sizeof(struct scb) * AHC_SCB_MAX_ALLOC,
>> GFP_ATOMIC);
>> if (scb_data->scbarray == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> /* Determine the number of hardware SCBs and initialize them */
>>
>> scb_data->maxhscbs = ahc_probe_scbs(ahc);
>> if (ahc->scb_data->maxhscbs == 0) {
>> printk("%s: No SCB space found\n", ahc_name(ahc));
>> - return (ENXIO);
>> + return -ENXIO;
>> }
>>
>> /*
>> @@ -4904,7 +4904,7 @@ ahc_init_scbdata(struct ahc_softc *ahc)
>>
>> error_exit:
>>
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> static void
>> @@ -5339,7 +5339,7 @@ ahc_init(struct ahc_softc *ahc)
>> /*maxsegsz*/AHC_MAXTRANSFER_SIZE,
>> /*flags*/BUS_DMA_ALLOCNOW,
>> &ahc->buffer_dmat) != 0) {
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>> #endif
>>
>> @@ -5367,7 +5367,7 @@ ahc_init(struct ahc_softc *ahc)
>> /*nsegments*/1,
>> /*maxsegsz*/BUS_SPACE_MAXSIZE_32BIT,
>> /*flags*/0, &ahc->shared_data_dmat) != 0) {
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> ahc->init_level++;
>> @@ -5376,7 +5376,7 @@ ahc_init(struct ahc_softc *ahc)
>> if (ahc_dmamem_alloc(ahc, ahc->shared_data_dmat,
>> (void **)&ahc->qoutfifo,
>> BUS_DMA_NOWAIT, &ahc->shared_data_dmamap) != 0) {
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> ahc->init_level++;
>> @@ -5404,7 +5404,7 @@ ahc_init(struct ahc_softc *ahc)
>> /* Allocate SCB data now that buffer_dmat is initialized */
>> if (ahc->scb_data->maxhscbs == 0)
>> if (ahc_init_scbdata(ahc) != 0)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> /*
>> * Allocate a tstate to house information for our
>> @@ -5414,14 +5414,14 @@ ahc_init(struct ahc_softc *ahc)
>> if (ahc_alloc_tstate(ahc, ahc->our_id, 'A') == NULL) {
>> printk("%s: unable to allocate ahc_tmode_tstate. "
>> "Failing attach\n", ahc_name(ahc));
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> if ((ahc->features & AHC_TWIN) != 0) {
>> if (ahc_alloc_tstate(ahc, ahc->our_id_b, 'B') == NULL) {
>> printk("%s: unable to allocate ahc_tmode_tstate. "
>> "Failing attach\n", ahc_name(ahc));
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>> }
>>
>> @@ -5660,7 +5660,7 @@ ahc_suspend(struct ahc_softc *ahc)
>>
>> if (LIST_FIRST(&ahc->pending_scbs) != NULL) {
>> ahc_unpause(ahc);
>> - return (EBUSY);
>> + return -EBUSY;
>> }
>>
>> #ifdef AHC_TARGET_MODE
>> @@ -5671,7 +5671,7 @@ ahc_suspend(struct ahc_softc *ahc)
>> */
>> if (ahc->pending_device != NULL) {
>> ahc_unpause(ahc);
>> - return (EBUSY);
>> + return -EBUSY;
>> }
>> #endif
>> ahc_shutdown(ahc);
>> @@ -6908,7 +6908,7 @@ ahc_loadseq(struct ahc_softc *ahc)
>> printk("\n%s: Program too large for instruction memory "
>> "size of %d!\n", ahc_name(ahc),
>> ahc->instruction_ram_size);
>> - return (ENOMEM);
>> + return -ENOMEM;
>> }
>>
>> /*
>> diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c
>> b/drivers/scsi/aic7xxx/aic7xxx_osm.c
>> index fc6a831..78433f6 100644
>> --- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
>> +++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
>> @@ -835,7 +835,7 @@ ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t
>> parent,
>>
>> dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
>> if (dmat == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> /*
>> * Linux is very simplistic about DMA memory. For now don't
>> @@ -864,7 +864,7 @@ ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t
>> dmat, void** vaddr,
>> *vaddr = pci_alloc_consistent(ahc->dev_softc,
>> dmat->maxsize, mapp);
>> if (*vaddr == NULL)
>> - return ENOMEM;
>> + return -ENOMEM;
>> return 0;
>> }
>>
>> @@ -1096,7 +1096,7 @@ ahc_linux_register_host(struct ahc_softc *ahc, struct
>> scsi_host_template *templa
>> template->name = ahc->description;
>> host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
>> if (host == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> *((struct ahc_softc **)host->hostdata) = ahc;
>> ahc->platform_data->host = host;
>> @@ -1215,7 +1215,7 @@ ahc_platform_alloc(struct ahc_softc *ahc, void
>> *platform_arg)
>> ahc->platform_data =
>> kzalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
>> if (ahc->platform_data == NULL)
>> - return (ENOMEM);
>> + return -ENOMEM;
>> ahc->platform_data->irq = AHC_LINUX_NOIRQ;
>> ahc_lockinit(ahc);
>> ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
>> diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
>> b/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
>> index 0fc14da..8bca7f4 100644
>> --- a/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
>> +++ b/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
>> @@ -346,13 +346,13 @@ static int
>> ahc_linux_pci_reserve_io_region(struct ahc_softc *ahc, resource_size_t
>> *base)
>> {
>> if (aic7xxx_allow_memio == 0)
>> - return (ENOMEM);
>> + return -ENOMEM;
>>
>> *base = pci_resource_start(ahc->dev_softc, 0);
>> if (*base == 0)
>> - return (ENOMEM);
>> + return -ENOMEM;
>> if (!request_region(*base, 256, "aic7xxx"))
>> - return (ENOMEM);
>> + return -ENOMEM;
>> return (0);
>> }
>>
>> @@ -369,16 +369,16 @@ ahc_linux_pci_reserve_mem_region(struct ahc_softc *ahc,
>> if (start != 0) {
>> *bus_addr = start;
>> if (!request_mem_region(start, 0x1000, "aic7xxx"))
>> - error = ENOMEM;
>> + error = -ENOMEM;
>> if (error == 0) {
>> *maddr = ioremap_nocache(start, 256);
>> if (*maddr == NULL) {
>> - error = ENOMEM;
>> + error = -ENOMEM;
>> release_mem_region(start, 0x1000);
>> }
>> }
>> } else
>> - error = ENOMEM;
>> + error = -ENOMEM;
>> return (error);
>> }
>>
>> diff --git a/drivers/scsi/aic7xxx/aic7xxx_pci.c
>> b/drivers/scsi/aic7xxx/aic7xxx_pci.c
>> index 22d5a94..40e1c9b 100644
>> --- a/drivers/scsi/aic7xxx/aic7xxx_pci.c
>> +++ b/drivers/scsi/aic7xxx/aic7xxx_pci.c
>> @@ -806,7 +806,7 @@ ahc_pci_config(struct ahc_softc *ahc, const struct
>> ahc_pci_identity *entry)
>>
>> error = ahc_reset(ahc, /*reinit*/FALSE);
>> if (error != 0)
>> - return (ENXIO);
>> + return -ENXIO;
>>
>> if ((ahc->features & AHC_DT) != 0) {
>> u_int sfunct;
>> @@ -2387,7 +2387,7 @@ static int
>> ahc_raid_setup(struct ahc_softc *ahc)
>> {
>> printk("RAID functionality unsupported\n");
>> - return (ENXIO);
>> + return -ENXIO;
>> }
>>
>> static int
>> --
>> 2.5.1
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>
> Patch looks simple as the change is straightforward.
> However can you make the code consistent, some have parenthesis in return, some not.
I only changed lines that contain positive error returns. These files are already inconsistent
with returning with or without parenthesis. I can resend this patch with a second one that fixes
those inconsistencies, if the maintainer would accept that.
> How did this work before though if it was returning non-negative to the caller or upper layer
> Has this been tested to work with the changes
>
> Reviewed-by Laurence Oberman <loberman@...hat.com>
>
This worked because all returned value checks are the usual
if (function_that_might_err())
goto error;
So any return that isn't 0 is treated as an error.
Thanks for the review,
Luis
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