diff options
| author | Rex Zhang <rex.zhang@intel.com> | 2023-12-12 10:21:58 +0800 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2023-12-21 21:47:40 +0530 |
| commit | e271c0ba3f919c48e90c64b703538fbb7865cb63 (patch) | |
| tree | a162e5b4b3d92510aab52deeb9e1ec1742768e4d /drivers/dma | |
| parent | 3b08b3775593442be52cbb99efbccbd7fe4fa3fe (diff) | |
| download | linux-e271c0ba3f919c48e90c64b703538fbb7865cb63.tar.gz | |
dmaengine: idxd: Move dma_free_coherent() out of spinlocked context
Task may be rescheduled within dma_free_coherent(). So dma_free_coherent()
can't be called between spin_lock() and spin_unlock() to avoid Call Trace:
Call Trace:
<TASK>
dump_stack_lvl+0x37/0x50
__might_resched+0x16a/0x1c0
vunmap+0x2c/0x70
__iommu_dma_free+0x96/0x100
idxd_device_evl_free+0xd5/0x100 [idxd]
device_release_driver_internal+0x197/0x200
unbind_store+0xa1/0xb0
kernfs_fop_write_iter+0x120/0x1c0
vfs_write+0x2d3/0x400
ksys_write+0x63/0xe0
do_syscall_64+0x44/0xa0
entry_SYSCALL_64_after_hwframe+0x6e/0xd8
Move it out of the context.
Fixes: 244da66cda35 ("dmaengine: idxd: setup event log configuration")
Signed-off-by: Rex Zhang <rex.zhang@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Link: https://lore.kernel.org/r/20231212022158.358619-2-rex.zhang@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/idxd/device.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c index 8f754f922217de..fa0f880beae646 100644 --- a/drivers/dma/idxd/device.c +++ b/drivers/dma/idxd/device.c @@ -802,6 +802,9 @@ err_bmap: static void idxd_device_evl_free(struct idxd_device *idxd) { + void *evl_log; + unsigned int evl_log_size; + dma_addr_t evl_dma; union gencfg_reg gencfg; union genctrl_reg genctrl; struct device *dev = &idxd->pdev->dev; @@ -822,11 +825,15 @@ static void idxd_device_evl_free(struct idxd_device *idxd) iowrite64(0, idxd->reg_base + IDXD_EVLCFG_OFFSET); iowrite64(0, idxd->reg_base + IDXD_EVLCFG_OFFSET + 8); - dma_free_coherent(dev, evl->log_size, evl->log, evl->dma); bitmap_free(evl->bmap); + evl_log = evl->log; + evl_log_size = evl->log_size; + evl_dma = evl->dma; evl->log = NULL; evl->size = IDXD_EVL_SIZE_MIN; spin_unlock(&evl->lock); + + dma_free_coherent(dev, evl_log_size, evl_log, evl_dma); } static void idxd_group_config_write(struct idxd_group *group) |