From de01283baa334b1d938cfd9121198c517ad6dc89 Mon Sep 17 00:00:00 2001 From: "Matthew R. Ochs" Date: Mon, 28 Nov 2016 18:42:33 -0600 Subject: [PATCH] scsi: cxlflash: Wait for active AFU commands to timeout upon tear down With the removal of the static private command pool, the ability to 'complete' outstanding commands was lost. While not an issue for the commands originating outside the driver, internal AFU commands are synchronous and therefore have a timeout associated with them. To avoid a stale memory access, the tear down sequence needs to ensure that there are not any active commands before proceeding. As these internal AFU commands are rare events, the simplest way to accomplish this is detecting the activity and waiting for it to timeout. Signed-off-by: Matthew R. Ochs Acked-by: Uma Krishnan Signed-off-by: Martin K. Petersen --- drivers/scsi/cxlflash/common.h | 1 + drivers/scsi/cxlflash/main.c | 6 +++++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h index 7e4ba31935b5..621167794026 100644 --- a/drivers/scsi/cxlflash/common.h +++ b/drivers/scsi/cxlflash/common.h @@ -180,6 +180,7 @@ struct afu { u64 *hrrq_end; u64 *hrrq_curr; bool toggle; + atomic_t cmds_active; /* Number of currently active AFU commands */ s64 room; spinlock_t rrin_slock; /* Lock to rrin queuing and cmd_room updates */ u64 hb; diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c index 19156adb0b69..839eca4c4e02 100644 --- a/drivers/scsi/cxlflash/main.c +++ b/drivers/scsi/cxlflash/main.c @@ -531,7 +531,7 @@ static void free_mem(struct cxlflash_cfg *cfg) * * Safe to call with AFU in a partially allocated/initialized state. * - * Cleans up all state associated with the command queue, and unmaps + * Waits for any active internal AFU commands to timeout and then unmaps * the MMIO space. */ static void stop_afu(struct cxlflash_cfg *cfg) @@ -539,6 +539,8 @@ static void stop_afu(struct cxlflash_cfg *cfg) struct afu *afu = cfg->afu; if (likely(afu)) { + while (atomic_read(&afu->cmds_active)) + ssleep(1); if (likely(afu->afu_map)) { cxl_psa_unmap((void __iomem *)afu->afu_map); afu->afu_map = NULL; @@ -1721,6 +1723,7 @@ int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u, } mutex_lock(&sync_active); + atomic_inc(&afu->cmds_active); buf = kzalloc(sizeof(*cmd) + __alignof__(*cmd) - 1, GFP_KERNEL); if (unlikely(!buf)) { dev_err(dev, "%s: no memory for command\n", __func__); @@ -1762,6 +1765,7 @@ int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx_hndl_u, (cmd->sa.host_use_b[0] & B_ERROR))) rc = -1; out: + atomic_dec(&afu->cmds_active); mutex_unlock(&sync_active); kfree(buf); pr_debug("%s: returning rc=%d\n", __func__, rc); -- 2.20.1