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serial/ptmx: Add lock to avoid the race condition in ptmx_minor_free

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Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Xiang Xiao
2022-02-06 17:35:13 +08:00
committed by Petro Karashchenko
parent fdc74dd05f
commit 6cc0388f4f
1 changed files with 4 additions and 0 deletions
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drivers/serial/ptmx.c
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@@ -299,6 +299,8 @@ void ptmx_minor_free(uint8_t minor)
int index; int index;
int bitno; int bitno;
nxsem_wait_uninterruptible(&g_ptmx.px_exclsem);
/* Free the address by clearing the associated bit in the px_alloctab[]; */ /* Free the address by clearing the associated bit in the px_alloctab[]; */
index = minor >> 5; index = minor >> 5;
@@ -313,4 +315,6 @@ void ptmx_minor_free(uint8_t minor)
{ {
g_ptmx.px_next = minor; g_ptmx.px_next = minor;
} }
nxsem_post(&g_ptmx.px_exclsem);
} }