On 19 October 2018 at 16:40, Jonas Danielsson <jonas@xxxxxxxxxxxxxxxxxxx> wrote: > On our AT91SAM9260 board we use the same sdio bus for wifi and for the > sd card slot. This caused the atmel-mci to give the following splat on > the serial console: > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 538 at drivers/mmc/host/atmel-mci.c:859 atmci_send_command+0x24/0x44 > Modules linked in: > CPU: 0 PID: 538 Comm: mmcqd/0 Not tainted 4.14.76 #14 > Hardware name: Atmel AT91SAM9 > [<c000fccc>] (unwind_backtrace) from [<c000d3dc>] (show_stack+0x10/0x14) > [<c000d3dc>] (show_stack) from [<c0017644>] (__warn+0xd8/0xf4) > [<c0017644>] (__warn) from [<c0017704>] (warn_slowpath_null+0x1c/0x24) > [<c0017704>] (warn_slowpath_null) from [<c033bb9c>] (atmci_send_command+0x24/0x44) > [<c033bb9c>] (atmci_send_command) from [<c033e984>] (atmci_start_request+0x1f4/0x2dc) > [<c033e984>] (atmci_start_request) from [<c033f3b4>] (atmci_request+0xf0/0x164) > [<c033f3b4>] (atmci_request) from [<c0327108>] (mmc_start_request+0x280/0x2d0) > [<c0327108>] (mmc_start_request) from [<c032800c>] (mmc_start_areq+0x230/0x330) > [<c032800c>] (mmc_start_areq) from [<c03366f8>] (mmc_blk_issue_rw_rq+0xc4/0x310) > [<c03366f8>] (mmc_blk_issue_rw_rq) from [<c03372c4>] (mmc_blk_issue_rq+0x118/0x5ac) > [<c03372c4>] (mmc_blk_issue_rq) from [<c033781c>] (mmc_queue_thread+0xc4/0x118) > [<c033781c>] (mmc_queue_thread) from [<c002daf8>] (kthread+0x100/0x118) > [<c002daf8>] (kthread) from [<c000a580>] (ret_from_fork+0x14/0x34) > ---[ end trace 594371ddfa284bd6 ]--- > > This is: > WARN_ON(host->cmd); > > This was fixed on our board by letting atmci_request_end determine what > state we are in. Instead of unconditionally setting it to STATE_IDLE on > STATE_END_REQUEST. I am sure this change is just papering over much more bigger issues [1], which are present when using one host for multiple slots. In either case, as it seems to improve things, I have queued it up for 4.21, thanks! Kind regards Uffe [1] https://www.spinics.net/lists/linux-mmc/msg49815.html > > Signed-off-by: Jonas Danielsson <jonas@xxxxxxxxxxxxxxxxxxx> > --- > drivers/mmc/host/atmel-mci.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c > index 0a0ebf3a0..c8a591d8a 100644 > --- a/drivers/mmc/host/atmel-mci.c > +++ b/drivers/mmc/host/atmel-mci.c > @@ -1954,13 +1954,14 @@ static void atmci_tasklet_func(unsigned long priv) > } > > atmci_request_end(host, host->mrq); > - state = STATE_IDLE; > + goto unlock; /* atmci_request_end() sets host->state */ > break; > } > } while (state != prev_state); > > host->state = state; > > +unlock: > spin_unlock(&host->lock); > } > > -- > 2.17.2 >
