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authorSumit.Saxena@avagotech.com <Sumit.Saxena@avagotech.com>2015-05-06 19:01:02 +0530
committerJames Bottomley <JBottomley@Odin.com>2015-06-01 07:32:42 -0700
commit2be2a98845e6742a96d48534294d2c5ba582e57f (patch)
treed92f8cbe059e9076f9ad0fb09f0ed75fd85e0017 /include/scsi
parentb84b1d522f979fb53ad347605e24b2940fa2ad99 (diff)
downloadlinux-2be2a98845e6742a96d48534294d2c5ba582e57f.tar.bz2
megaraid_sas : Modify return value of megasas_issue_blocked_cmd() and wait_and_poll() to consider command status returned by firmware
This patch is rebased on top of recently sent 18 patches(submitted by me) for megaraid_sas driver. Change the return value of wait_and_poll() and megsas_issue_blocked_cmd() based on MFI_STAT returned by firmware for that command. Earlier driver always send return type based on command completion (but never check MFI_STAT_OK for that command), so even if command is failed by firmware still driver will return SUCCESS status from these functions wait_and_poll() and megsas_issue_blocked_cmd() and if caller of these functions does not check command status (MFI_STAT), then it may endup using invalid data returned in DMA buffers(one of the example is megasas_ld_list_query DCMD). Best thing to avoid this type of issue is do error handling and set proper return type from caller function wait_and_poll() and megsas_issue_blocked_cmd(). The change proposed in this patch will fix the regression introduced in patch- "90dc9d9 megaraid_sas : MFI MPT linked list corruption fix" inside function megasas_ld_list_query(). Prior to this MFI MPT linked list corruption fix patch, megasas_ld_list_query() function used to check DCMD status(returned by firmware) but with this linked list corruption fix patch, DCMD status will not be checked inside function megasas_ld_list_query() and introduced this issue of wrong data being used by function megasas_ld_list_query(). Cc: <stable@vger.kernel.org> Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com> Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com> Reviewed-by: Tomas Henzl <thenzl@redhat.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
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