linux-kernel - [PATCH 2/2] scsi: Preserve retry counter through scsi_prep

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Date:   Mon, 21 Aug 2017 17:14:00 -0500
From:   Brian King <brking@...ux.vnet.ibm.com>
To:     Bart Van Assche <Bart.VanAssche@....com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "abdhalee@...ux.vnet.ibm.com" <abdhalee@...ux.vnet.ibm.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hch@....de" <hch@....de>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
        "sachinp@...ux.vnet.ibm.com" <sachinp@...ux.vnet.ibm.com>,
        "linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
        "hare@...e.com" <hare@...e.com>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>
Subject: [PATCH 2/2] scsi: Preserve retry counter through scsi_prep_fn

Save / restore the retry counter in scsi_cmd in scsi_init_command.
This allows us to go back through scsi_init_command for retries
and not forget we are doing a retry.

Signed-off-by: Brian King <brking@...ux.vnet.ibm.com>
---

Index: linux-2.6.git/drivers/scsi/scsi_lib.c
===================================================================
--- linux-2.6.git.orig/drivers/scsi/scsi_lib.c
+++ linux-2.6.git/drivers/scsi/scsi_lib.c
@@ -1155,6 +1155,7 @@ void scsi_init_command(struct scsi_devic
 	void *prot = cmd->prot_sdb;
 	unsigned int unchecked_isa_dma = cmd->flags & SCMD_UNCHECKED_ISA_DMA;
 	unsigned long jiffies_at_alloc = cmd->jiffies_at_alloc;
+	int retries = cmd->retries;
 
 	/* zero out the cmd, except for the embedded scsi_request */
 	memset((char *)cmd + sizeof(cmd->req), 0,
@@ -1166,6 +1167,7 @@ void scsi_init_command(struct scsi_devic
 	cmd->flags = unchecked_isa_dma;
 	INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler);
 	cmd->jiffies_at_alloc = jiffies_at_alloc;
+	cmd->retries = retries;
 
 	scsi_add_cmd_to_list(cmd);
 }