[PATCH AUTOSEL 6.12 26/36] scsi: mpi3mr: Fix corrupt config pages PHY state is switched in sysfs
From: Sasha Levin
Date: Wed Dec 11 2024 - 13:56:28 EST
From: Ranjan Kumar <ranjan.kumar@xxxxxxxxxxxx>
[ Upstream commit 711201a8b8334a397440ac0b859df0054e174bc9 ]
The driver, through the SAS transport, exposes a sysfs interface to
enable/disable PHYs in a controller/expander setup. When multiple PHYs
are disabled and enabled in rapid succession, the persistent and current
config pages related to SAS IO unit/SAS Expander pages could get
corrupted.
Use separate memory for each config request.
Signed-off-by: Prayas Patel <prayas.patel@xxxxxxxxxxxx>
Signed-off-by: Ranjan Kumar <ranjan.kumar@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20241110194405.10108-3-ranjan.kumar@xxxxxxxxxxxx
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/scsi/mpi3mr/mpi3mr.h | 9 ----
drivers/scsi/mpi3mr/mpi3mr_fw.c | 81 ++++++---------------------------
2 files changed, 13 insertions(+), 77 deletions(-)
diff --git a/drivers/scsi/mpi3mr/mpi3mr.h b/drivers/scsi/mpi3mr/mpi3mr.h
index 81bb408ce56d8..1e715fd65a7d4 100644
--- a/drivers/scsi/mpi3mr/mpi3mr.h
+++ b/drivers/scsi/mpi3mr/mpi3mr.h
@@ -134,8 +134,6 @@ extern atomic64_t event_counter;
#define MPI3MR_WATCHDOG_INTERVAL 1000 /* in milli seconds */
-#define MPI3MR_DEFAULT_CFG_PAGE_SZ 1024 /* in bytes */
-
#define MPI3MR_RESET_TOPOLOGY_SETTLE_TIME 10
#define MPI3MR_SCMD_TIMEOUT (60 * HZ)
@@ -1133,9 +1131,6 @@ struct scmd_priv {
* @io_throttle_low: I/O size to stop throttle in 512b blocks
* @num_io_throttle_group: Maximum number of throttle groups
* @throttle_groups: Pointer to throttle group info structures
- * @cfg_page: Default memory for configuration pages
- * @cfg_page_dma: Configuration page DMA address
- * @cfg_page_sz: Default configuration page memory size
* @sas_transport_enabled: SAS transport enabled or not
* @scsi_device_channel: Channel ID for SCSI devices
* @transport_cmds: Command tracker for SAS transport commands
@@ -1332,10 +1327,6 @@ struct mpi3mr_ioc {
u16 num_io_throttle_group;
struct mpi3mr_throttle_group_info *throttle_groups;
- void *cfg_page;
- dma_addr_t cfg_page_dma;
- u16 cfg_page_sz;
-
u8 sas_transport_enabled;
u8 scsi_device_channel;
struct mpi3mr_drv_cmd transport_cmds;
diff --git a/drivers/scsi/mpi3mr/mpi3mr_fw.c b/drivers/scsi/mpi3mr/mpi3mr_fw.c
index f1ab76351bd81..2e6245bd4282e 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_fw.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_fw.c
@@ -4186,17 +4186,6 @@ int mpi3mr_init_ioc(struct mpi3mr_ioc *mrioc)
mpi3mr_read_tsu_interval(mrioc);
mpi3mr_print_ioc_info(mrioc);
- if (!mrioc->cfg_page) {
- dprint_init(mrioc, "allocating config page buffers\n");
- mrioc->cfg_page_sz = MPI3MR_DEFAULT_CFG_PAGE_SZ;
- mrioc->cfg_page = dma_alloc_coherent(&mrioc->pdev->dev,
- mrioc->cfg_page_sz, &mrioc->cfg_page_dma, GFP_KERNEL);
- if (!mrioc->cfg_page) {
- retval = -1;
- goto out_failed_noretry;
- }
- }
-
dprint_init(mrioc, "allocating host diag buffers\n");
mpi3mr_alloc_diag_bufs(mrioc);
@@ -4768,11 +4757,7 @@ void mpi3mr_free_mem(struct mpi3mr_ioc *mrioc)
mrioc->admin_req_base, mrioc->admin_req_dma);
mrioc->admin_req_base = NULL;
}
- if (mrioc->cfg_page) {
- dma_free_coherent(&mrioc->pdev->dev, mrioc->cfg_page_sz,
- mrioc->cfg_page, mrioc->cfg_page_dma);
- mrioc->cfg_page = NULL;
- }
+
if (mrioc->pel_seqnum_virt) {
dma_free_coherent(&mrioc->pdev->dev, mrioc->pel_seqnum_sz,
mrioc->pel_seqnum_virt, mrioc->pel_seqnum_dma);
@@ -5392,55 +5377,6 @@ int mpi3mr_soft_reset_handler(struct mpi3mr_ioc *mrioc,
return retval;
}
-
-/**
- * mpi3mr_free_config_dma_memory - free memory for config page
- * @mrioc: Adapter instance reference
- * @mem_desc: memory descriptor structure
- *
- * Check whether the size of the buffer specified by the memory
- * descriptor is greater than the default page size if so then
- * free the memory pointed by the descriptor.
- *
- * Return: Nothing.
- */
-static void mpi3mr_free_config_dma_memory(struct mpi3mr_ioc *mrioc,
- struct dma_memory_desc *mem_desc)
-{
- if ((mem_desc->size > mrioc->cfg_page_sz) && mem_desc->addr) {
- dma_free_coherent(&mrioc->pdev->dev, mem_desc->size,
- mem_desc->addr, mem_desc->dma_addr);
- mem_desc->addr = NULL;
- }
-}
-
-/**
- * mpi3mr_alloc_config_dma_memory - Alloc memory for config page
- * @mrioc: Adapter instance reference
- * @mem_desc: Memory descriptor to hold dma memory info
- *
- * This function allocates new dmaable memory or provides the
- * default config page dmaable memory based on the memory size
- * described by the descriptor.
- *
- * Return: 0 on success, non-zero on failure.
- */
-static int mpi3mr_alloc_config_dma_memory(struct mpi3mr_ioc *mrioc,
- struct dma_memory_desc *mem_desc)
-{
- if (mem_desc->size > mrioc->cfg_page_sz) {
- mem_desc->addr = dma_alloc_coherent(&mrioc->pdev->dev,
- mem_desc->size, &mem_desc->dma_addr, GFP_KERNEL);
- if (!mem_desc->addr)
- return -ENOMEM;
- } else {
- mem_desc->addr = mrioc->cfg_page;
- mem_desc->dma_addr = mrioc->cfg_page_dma;
- memset(mem_desc->addr, 0, mrioc->cfg_page_sz);
- }
- return 0;
-}
-
/**
* mpi3mr_post_cfg_req - Issue config requests and wait
* @mrioc: Adapter instance reference
@@ -5596,8 +5532,12 @@ static int mpi3mr_process_cfg_req(struct mpi3mr_ioc *mrioc,
cfg_req->page_length = cfg_hdr->page_length;
cfg_req->page_version = cfg_hdr->page_version;
}
- if (mpi3mr_alloc_config_dma_memory(mrioc, &mem_desc))
- goto out;
+
+ mem_desc.addr = dma_alloc_coherent(&mrioc->pdev->dev,
+ mem_desc.size, &mem_desc.dma_addr, GFP_KERNEL);
+
+ if (!mem_desc.addr)
+ return retval;
mpi3mr_add_sg_single(&cfg_req->sgl, sgl_flags, mem_desc.size,
mem_desc.dma_addr);
@@ -5626,7 +5566,12 @@ static int mpi3mr_process_cfg_req(struct mpi3mr_ioc *mrioc,
}
out:
- mpi3mr_free_config_dma_memory(mrioc, &mem_desc);
+ if (mem_desc.addr) {
+ dma_free_coherent(&mrioc->pdev->dev, mem_desc.size,
+ mem_desc.addr, mem_desc.dma_addr);
+ mem_desc.addr = NULL;
+ }
+
return retval;
}
--
2.43.0