Larry Finger <Larry.Finger@xxxxxxxxxxxx> writes:
> Following commit cceb0a597320 ("rtlwifi: Add work queue for c2h cmd."),
> the following BUG is reported when rtl8723be is used:
>
> BUG: sleeping function called from invalid context at mm/slab.h:432
> in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: swapper/0
> CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W O 4.11.0-rc3-wl+ #276
> Hardware name: TOSHIBA TECRA A50-A/TECRA A50-A, BIOS Version 4.50 09/29/2014
> Call Trace:
> <IRQ>
> dump_stack+0x63/0x89
> ___might_sleep+0xe9/0x130
> __might_sleep+0x4a/0x90
> kmem_cache_alloc_trace+0x19f/0x200
> ? rtl_c2hcmd_enqueue+0x3e/0x110 [rtlwifi]
> rtl_c2hcmd_enqueue+0x3e/0x110 [rtlwifi]
> rtl8723be_c2h_packet_handler+0xac/0xc0 [rtl8723be]
> rtl8723be_rx_command_packet+0x37/0x5c [rtl8723be]
> _rtl_pci_rx_interrupt+0x200/0x6b0 [rtl_pci]
> _rtl_pci_interrupt+0x20c/0x5d0 [rtl_pci]
> __handle_irq_event_percpu+0x3f/0x1d0
> handle_irq_event_percpu+0x23/0x60
> handle_irq_event+0x3c/0x60
> handle_fasteoi_irq+0xa2/0x170
> handle_irq+0x20/0x30
> do_IRQ+0x48/0xd0
> common_interrupt+0x89/0x89
> ...
>
> Although commit cceb0a597320 converted most c2h commands to use a work
> queue, the Bluetooth coexistence routines can be in atomic mode when
> they execute such a call.
>
> Fixes: cceb0a597320 ("rtlwifi: Add work queue for c2h cmd.")
> Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
> Cc: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
> ---
> Kalle,
>
> This patch should be applied to kernel 4.11.
Ok, I'll queue this for 4.11.
--
Kalle Valo
