linux-kernel - [BUG] rts5208: Sleeping under a spin lock in xd_init_l2p

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Date:   Mon, 05 Jun 2017 09:38:14 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     Greg KH <gregkh@...uxfoundation.org>, wporter82@...il.com,
        sergio.paracuellos@...il.com, aquannie@...il.com
CC:     devel@...verdev.osuosl.org, LKML <linux-kernel@...r.kernel.org>
Subject: [BUG] rts5208: Sleeping under a spin lock in xd_init_l2p_tbl

According to rtsx_chip.c and xd.c, the driver may sleep under a spin lock.
The function call path is:
rtsx_exclusive_enter_ss (acquire the lock by spin_lock)
   rtsx_enter_ss
     rtsx_power_off_card
       xd_cleanup_work
         xd_delay_write
           xd_finish_write
             xd_set_unused_block
               xd_build_l2p_tbl
                 xd_init_l2p_tbl
                   vmalloc --> may sleep

This bug is found by my static analysis tool and my code review.
I hope to fix it, but I do not have a good solution.

Thanks,
Jia-Ju Bai