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The driver may sleep with holding a spinlock.
The function call paths (from bottom to top) in Linux-4.17 are:
[FUNC] msleep
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c, 3805:
msleep in issue_deauth_ex
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c, 6336:
issue_deauth_ex in disconnect_hdl
drivers/staging/rtl8723bs/core/rtw_cmd.c, 963:
disconnect_hdl in rtw_disassoc_cmd
drivers/staging/rtl8723bs/core/rtw_ioctl_set.c, 506:
rtw_disassoc_cmd in rtw_set_802_11_disassociate
drivers/staging/rtl8723bs/core/rtw_ioctl_set.c, 501:
spin_lock_bh in rtw_set_802_11_disassociate
[FUNC] msleep
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c, 3805:
msleep in issue_deauth_ex
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c, 6336:
issue_deauth_ex in disconnect_hdl
drivers/staging/rtl8723bs/core/rtw_cmd.c, 963:
disconnect_hdl in rtw_disassoc_cmd
drivers/staging/rtl8723bs/core/rtw_mlme.c, 2256:
rtw_disassoc_cmd in rtw_select_and_join_from_scanned_queue
drivers/staging/rtl8723bs/core/rtw_mlme.c, 2204:
spin_lock_bh in rtw_select_and_join_from_scanned_queue
To fix this bug, msleep() is replaced with mdelay().
This bug is found by my static analysis tool DSAC.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1c8cb89ee9