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authorDave Jiang <dave.jiang@intel.com>2021-04-16 02:37:27 +0300
committerVinod Koul <vkoul@kernel.org>2021-04-20 14:13:53 +0300
commitf7f7739847bd68b3c3103fd1b50d943038bd14c7 (patch)
tree5b3230f14dc5e2c7b66dbca151904199eec407f3 /drivers/dma
parenta39c7cd0438ee2f0b859ee1eb86cdc52217d2223 (diff)
downloadlinux-f7f7739847bd68b3c3103fd1b50d943038bd14c7.tar.xz
dmaengine: idxd: use ida for device instance enumeration
The idr is only used for an device id, never to lookup context from that id. Switch to plain ida. Fixes: bfe1d56091c1 ("dmaengine: idxd: Init and probe for Intel data accelerators") Reported-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/161852984730.2203940.15032482460902003819.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/idxd/init.c17
1 files changed, 6 insertions, 11 deletions
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index 11a2e14b5b80..a4f0489515b4 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -34,8 +34,7 @@ MODULE_PARM_DESC(sva, "Toggle SVA support on/off");
bool support_enqcmd;
-static struct idr idxd_idrs[IDXD_TYPE_MAX];
-static DEFINE_MUTEX(idxd_idr_lock);
+static struct ida idxd_idas[IDXD_TYPE_MAX];
static struct pci_device_id idxd_pci_tbl[] = {
/* DSA ver 1.0 platforms */
@@ -348,12 +347,10 @@ static int idxd_probe(struct idxd_device *idxd)
dev_dbg(dev, "IDXD interrupt setup complete.\n");
- mutex_lock(&idxd_idr_lock);
- idxd->id = idr_alloc(&idxd_idrs[idxd->type], idxd, 0, 0, GFP_KERNEL);
- mutex_unlock(&idxd_idr_lock);
+ idxd->id = ida_alloc(&idxd_idas[idxd->type], GFP_KERNEL);
if (idxd->id < 0) {
rc = -ENOMEM;
- goto err_idr_fail;
+ goto err_ida_fail;
}
idxd->major = idxd_cdev_get_major(idxd);
@@ -361,7 +358,7 @@ static int idxd_probe(struct idxd_device *idxd)
dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id);
return 0;
- err_idr_fail:
+ err_ida_fail:
idxd_mask_error_interrupts(idxd);
idxd_mask_msix_vectors(idxd);
err_setup:
@@ -518,9 +515,7 @@ static void idxd_remove(struct pci_dev *pdev)
idxd_shutdown(pdev);
if (device_pasid_enabled(idxd))
idxd_disable_system_pasid(idxd);
- mutex_lock(&idxd_idr_lock);
- idr_remove(&idxd_idrs[idxd->type], idxd->id);
- mutex_unlock(&idxd_idr_lock);
+ ida_free(&idxd_idas[idxd->type], idxd->id);
}
static struct pci_driver idxd_pci_driver = {
@@ -550,7 +545,7 @@ static int __init idxd_init_module(void)
support_enqcmd = true;
for (i = 0; i < IDXD_TYPE_MAX; i++)
- idr_init(&idxd_idrs[i]);
+ ida_init(&idxd_idas[i]);
err = idxd_register_bus_type();
if (err < 0)