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soc: rockchip: rk_dmabuf_procfs: protect dmabuf linked list from concurrent access

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Change-Id: I36c844db01622006aaae1b4173663f5442693b3c
Signed-off-by: Simon Xue <xxm@rock-chips.com>
This commit is contained in:
Simon Xue
2025-01-15 11:04:06 +08:00
parent 51b493642c
commit f03f3720bb
1 changed files with 9 additions and 0 deletions
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9
drivers/soc/rockchip/rk_dmabuf_procfs.c
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@@ -10,6 +10,7 @@
#include <linux/scatterlist.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/dma-resv.h>
#define K(size) ((unsigned long)((size) >> 10))
static struct device *dmabuf_dev;
@@ -59,6 +60,8 @@ static void rk_dmabuf_dump_sgt(const struct dma_buf *dmabuf, void *private)
phys_addr_t end, len;
int i;
dma_resv_lock(dmabuf->resv, NULL);
list_for_each_entry_safe(a, t, &dmabuf->attachments, node) {
if (!a->sgt)
continue;
@@ -76,8 +79,12 @@ static void rk_dmabuf_dump_sgt(const struct dma_buf *dmabuf, void *private)
(len >> 10) ? (K(len)) : (unsigned long)len,
(len >> 10) ? "KiB" : "Bytes");
}
dma_resv_unlock(dmabuf->resv);
return;
}
dma_resv_unlock(dmabuf->resv);
/* Try to attach and map the dmabufs without sgt. */
if (IS_ENABLED(CONFIG_RK_DMABUF_DEBUG_ADVANCED)) {
struct dma_buf *dbuf = (struct dma_buf *)dmabuf;
@@ -105,9 +112,11 @@ static int rk_dmabuf_cb3(const struct dma_buf *dmabuf, void *private)
seq_printf(s, "%px %-16.16s %-16.16s %10lu KiB",
dmabuf, dmabuf->name,
dmabuf->exp_name, K(dmabuf->size));
dma_resv_lock(dmabuf->resv, NULL);
list_for_each_entry_safe(a, t, &dmabuf->attachments, node) {
seq_printf(s, " %s", dev_name(a->dev));
}
dma_resv_unlock(dmabuf->resv);
seq_puts(s, "\n");
return 0;