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Date: Mon, 27 Dec 2010 12:27:56 +0100 (CET)
From: Jiri Kosina <jkosina@...e.cz>
To: Ralph Loader <suckfish@...g.co.nz>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix some incorrect use of positive error codes.
On Sun, 26 Dec 2010, Ralph Loader wrote:
> Fix a few places where positive EFOO error codes were being returned
> where negative error codes are required.
>
> Most of these are trivial. Explanations of the other two:
>
> cfrfml.c:cfrfml_receive() was returning -EPROTO in one place and
> (+) EPROTO in another. Delete the positive case; the return code has
> already been initialised to -EPROTO at that point.
>
> In arch/ppc, cmm.c:cmm_memory_cb() was passing a positive error-code
> returned from cmm_mem_going_offline() to notifier_from_errno().
> But the latter expects negative error codes. Resolve the inconsistency
> by returning the 'notifier' value from cmm_mem_going_offline() in the
> first place.
>
> These were found using coccinelle to grep for returning positive EFOO,
> and then going through the 300 or so hits to find a dozen or so
> that were obviously wrong. It is almost certain that I missed some
> problems - some places (notably XFS and a few drivers in staging) use
> both positive and negative error codes, making it difficult to know
> which is intended where.
Could you please split the staging bits and submit them separately to
Greg?
Thanks.
>
> Signed-off-by: Ralph Loader <suckfish@...g.co.nz>
> ---
> arch/powerpc/platforms/pseries/cmm.c | 18 +++++-------------
> drivers/staging/ath6kl/os/linux/ioctl.c | 10 +++++-----
> drivers/staging/brcm80211/brcmfmac/wl_iw.c | 2 +-
> drivers/staging/cxt1e1/linux.c | 2 +-
> .../staging/westbridge/astoria/device/cyasdevice.c | 2 +-
> fs/cifs/cifsencrypt.c | 2 +-
> net/caif/cfrfml.c | 1 -
> 7 files changed, 14 insertions(+), 23 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c
> index f480386..3542fdc 100644
> --- a/arch/powerpc/platforms/pseries/cmm.c
> +++ b/arch/powerpc/platforms/pseries/cmm.c
> @@ -526,7 +526,7 @@ static struct notifier_block cmm_mem_isolate_nb = {
> * @arg: memory_notify structure with page range to be offlined
> *
> * Return value:
> - * 0 on success
> + * NOTIFY_OK on success
> **/
> static int cmm_mem_going_offline(void *arg)
> {
> @@ -581,7 +581,7 @@ static int cmm_mem_going_offline(void *arg)
> cmm_dbg("Failed to allocate memory for list "
> "management. Memory hotplug "
> "failed.\n");
> - return ENOMEM;
> + return notifier_from_errno(-ENOMEM);
> }
> memcpy(npa, pa_curr, PAGE_SIZE);
> if (pa_curr == cmm_page_list)
> @@ -600,7 +600,7 @@ static int cmm_mem_going_offline(void *arg)
> spin_unlock(&cmm_lock);
> cmm_dbg("Released %ld pages in the search range.\n", freed);
>
> - return 0;
> + return NOTIFY_OK;
> }
>
> /**
> @@ -616,14 +616,11 @@ static int cmm_mem_going_offline(void *arg)
> static int cmm_memory_cb(struct notifier_block *self,
> unsigned long action, void *arg)
> {
> - int ret = 0;
> -
> switch (action) {
> case MEM_GOING_OFFLINE:
> mutex_lock(&hotplug_mutex);
> hotplug_occurred = 1;
> - ret = cmm_mem_going_offline(arg);
> - break;
> + return cmm_mem_going_offline(arg);
> case MEM_OFFLINE:
> case MEM_CANCEL_OFFLINE:
> mutex_unlock(&hotplug_mutex);
> @@ -635,12 +632,7 @@ static int cmm_memory_cb(struct notifier_block *self,
> break;
> }
>
> - if (ret)
> - ret = notifier_from_errno(ret);
> - else
> - ret = NOTIFY_OK;
> -
> - return ret;
> + return NOTIFY_OK;
> }
>
> static struct notifier_block cmm_mem_nb = {
> diff --git a/drivers/staging/ath6kl/os/linux/ioctl.c b/drivers/staging/ath6kl/os/linux/ioctl.c
> index d5f7ac0..0b10376 100644
> --- a/drivers/staging/ath6kl/os/linux/ioctl.c
> +++ b/drivers/staging/ath6kl/os/linux/ioctl.c
> @@ -440,7 +440,7 @@ ar6000_ioctl_set_rssi_threshold(struct net_device *dev, struct ifreq *rq)
> if (ar->rssi_map[j+1].rssi < ar->rssi_map[j].rssi) {
> SWAP_THOLD(ar->rssi_map[j+1], ar->rssi_map[j]);
> } else if (ar->rssi_map[j+1].rssi == ar->rssi_map[j].rssi) {
> - return EFAULT;
> + return -EFAULT;
> }
> }
> }
> @@ -449,7 +449,7 @@ ar6000_ioctl_set_rssi_threshold(struct net_device *dev, struct ifreq *rq)
> if (ar->rssi_map[j+1].rssi < ar->rssi_map[j].rssi) {
> SWAP_THOLD(ar->rssi_map[j+1], ar->rssi_map[j]);
> } else if (ar->rssi_map[j+1].rssi == ar->rssi_map[j].rssi) {
> - return EFAULT;
> + return -EFAULT;
> }
> }
> }
> @@ -2870,7 +2870,7 @@ int ar6000_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
> gpio_output_set_cmd.enable_mask,
> gpio_output_set_cmd.disable_mask);
> if (ret != A_OK) {
> - ret = EIO;
> + ret = -EIO;
> }
> }
> up(&ar->arSem);
> @@ -2950,7 +2950,7 @@ int ar6000_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
> gpio_register_cmd.gpioreg_id,
> gpio_register_cmd.value);
> if (ret != A_OK) {
> - ret = EIO;
> + ret = -EIO;
> }
>
> /* Wait for acknowledgement from Target */
> @@ -3041,7 +3041,7 @@ int ar6000_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
> } else {
> ret = ar6000_gpio_intr_ack(dev, gpio_intr_ack_cmd.ack_mask);
> if (ret != A_OK) {
> - ret = EIO;
> + ret = -EIO;
> }
> }
> up(&ar->arSem);
> diff --git a/drivers/staging/brcm80211/brcmfmac/wl_iw.c b/drivers/staging/brcm80211/brcmfmac/wl_iw.c
> index 979a494..b68bc54 100644
> --- a/drivers/staging/brcm80211/brcmfmac/wl_iw.c
> +++ b/drivers/staging/brcm80211/brcmfmac/wl_iw.c
> @@ -1369,7 +1369,7 @@ wl_iw_iscan_set_scan(struct net_device *dev,
> if (g_scan_specified_ssid) {
> WL_TRACE(("%s Specific SCAN already running ignoring BC scan\n",
> __func__));
> - return EBUSY;
> + return -EBUSY;
> }
>
> memset(&ssid, 0, sizeof(ssid));
> diff --git a/drivers/staging/cxt1e1/linux.c b/drivers/staging/cxt1e1/linux.c
> index c793028..7af4887 100644
> --- a/drivers/staging/cxt1e1/linux.c
> +++ b/drivers/staging/cxt1e1/linux.c
> @@ -548,7 +548,7 @@ do_set_port (struct net_device * ndev, void *data)
> return -EINVAL; /* get card info */
>
> if (pp.portnum >= ci->max_port) /* sanity check */
> - return ENXIO;
> + return -ENXIO;
>
> memcpy (&ci->port[pp.portnum].p, &pp, sizeof (struct sbecom_port_param));
> return mkret (c4_set_port (ci, pp.portnum));
> diff --git a/drivers/staging/westbridge/astoria/device/cyasdevice.c b/drivers/staging/westbridge/astoria/device/cyasdevice.c
> index c76e383..0889730 100644
> --- a/drivers/staging/westbridge/astoria/device/cyasdevice.c
> +++ b/drivers/staging/westbridge/astoria/device/cyasdevice.c
> @@ -389,7 +389,7 @@ EXPORT_SYMBOL(cyasdevice_gethaltag);
> static int __init cyasdevice_init(void)
> {
> if (cyasdevice_initialize() != 0)
> - return ENODEV;
> + return -ENODEV;
>
> return 0;
> }
> diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
> index f856732..76df22b 100644
> --- a/fs/cifs/cifsencrypt.c
> +++ b/fs/cifs/cifsencrypt.c
> @@ -585,7 +585,7 @@ setup_ntlmv2_rsp(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
>
> ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
> if (!ses->auth_key.response) {
> - rc = ENOMEM;
> + rc = -ENOMEM;
> ses->auth_key.len = 0;
> cERROR(1, "%s: Can't allocate auth blob", __func__);
> goto setup_ntlmv2_rsp_ret;
> diff --git a/net/caif/cfrfml.c b/net/caif/cfrfml.c
> index e2fb5fa..f5531c6 100644
> --- a/net/caif/cfrfml.c
> +++ b/net/caif/cfrfml.c
> @@ -162,7 +162,6 @@ static int cfrfml_receive(struct cflayer *layr, struct cfpkt *pkt)
> tmppkt = NULL;
>
> /* Verify that length is correct */
> - err = EPROTO;
> if (rfml->pdu_size != cfpkt_getlen(pkt) - RFM_HEAD_SIZE + 1)
> goto out;
> }
> --
> 1.7.3.4
>
--
Jiri Kosina
SUSE Labs, Novell Inc.
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