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J . Bottomley" , "Martin K . Petersen" , megaraidlinux.pdl@broadcom.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Ionut Nechita , Ionut Nechita , stable@vger.kernel.org Subject: [PATCH] scsi: megaraid_sas: return DID_SOFT_ERROR on zero-byte DONE_WITH_ERROR Date: Sun, 8 Feb 2026 20:06:04 +0200 Message-ID: <20260208180603.568353-2-sunlightlinux@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ionut Nechita When the MegaRAID firmware returns MFI_STAT_SCSI_DONE_WITH_ERROR (0x2d) with zero bytes transferred on a data-bearing command, the driver currently returns DID_OK to the SCSI midlayer. This causes the I/O to appear complete with no data, leading to hung tasks that block indefinitely. Production systems show the following repeated pattern: sd 0:0:9:0: [sdb] tag#24 BRCM Debug mfi stat 0x2d, data len requested/completed 0x1000/0x0 INFO: task systemd-udevd:267 blocked for more than 245 seconds. INFO: task modprobe:296 blocked for more than 246 seconds. When the firmware reports DONE_WITH_ERROR with no data transferred and no CHECK_CONDITION sense data, return DID_SOFT_ERROR instead of DID_OK. This causes the SCSI midlayer to retry the command up to cmd->allowed times (default 5), matching the established pattern used by mpt3sas and smartpqi for similar conditions. Commands with CHECK_CONDITION sense data are not affected -- they continue to be completed immediately with the sense data intact. Fixes: 9c915a8c99bc ("[SCSI] megaraid_sas: Add 9565/9285 specific code") Cc: stable@vger.kernel.org Signed-off-by: Ionut Nechita --- drivers/scsi/megaraid/megaraid_sas_base.c | 16 ++++++++++++++++ drivers/scsi/megaraid/megaraid_sas_fusion.c | 14 +++++++++++++- 2 files changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megar= aid/megaraid_sas_base.c index abbbc4b36cd1d..de35b7d5094d7 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -3682,6 +3682,22 @@ megasas_complete_cmd(struct megasas_instance *instan= ce, struct megasas_cmd *cmd, hdr->sense_len); } =20 + /* + * MFI firmware does not report actual bytes + * transferred, so we cannot compute residuals. + * If data was expected and no CHECK_CONDITION, + * retry via DID_SOFT_ERROR. The SCSI midlayer + * retries up to cmd->allowed times (default 5). + */ + if (hdr->scsi_status !=3D SAM_STAT_CHECK_CONDITION && + scsi_bufflen(cmd->scmd) > 0) { + cmd->scmd->result =3D DID_SOFT_ERROR << 16; + dev_warn(&instance->pdev->dev, + "megaraid_sas: DONE_WITH_ERROR (stat 0x%x) on cmd 0x%x to tgt %d, ret= rying\n", + hdr->cmd_status, hdr->cmd, + hdr->target_id); + } + break; =20 case MFI_STAT_LD_OFFLINE: diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/meg= araid/megaraid_sas_fusion.c index a6794f49e9fae..6021f1363ef4c 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -2066,7 +2066,19 @@ map_cmd_status(struct fusion_context *fusion, resid =3D (scsi_bufflen(scmd) - data_length); scsi_set_resid(scmd, resid); =20 - if (resid && + /* + * If data was expected but zero bytes were transferred + * and there is no CHECK_CONDITION sense data, retry via + * DID_SOFT_ERROR. The SCSI midlayer retries up to + * cmd->allowed times (default 5). + */ + if (data_length =3D=3D 0 && scsi_bufflen(scmd) > 0 && + ext_status !=3D SAM_STAT_CHECK_CONDITION) { + scmd->result =3D DID_SOFT_ERROR << 16; + scmd_printk(KERN_WARNING, scmd, + "megaraid_sas: zero data on DONE_WITH_ERROR (stat 0x%x, bufflen 0x%x),= retrying\n", + status, scsi_bufflen(scmd)); + } else if (resid && ((cmd_type =3D=3D READ_WRITE_LDIO) || (cmd_type =3D=3D READ_WRITE_SYSPDIO))) scmd_printk(KERN_INFO, scmd, "BRCM Debug mfi stat 0x%x, data len" --=20 2.52.0