Messages in this thread | | | Date | Sat, 25 Jun 2011 17:51:39 +0200 | From | f6bvp <> | Subject | Re: [AX25] inconsistent lock state |
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Hi,
I applied the patch and since then I could not reproduce the inconsistent lock state. Thus mkiss patch fixed it.
Thanks,
Bernard
Le 17/06/2011 16:11, Arnd Bergmann a écrit : > On Friday 17 June 2011 15:51:48 Ralf Baechle wrote: >> On Fri, Jun 17, 2011 at 03:36:15PM +0200, Arnd Bergmann wrote: >> >> (Removed Jarek from cc; his email bounces.) >> >>> The message hints that disc_data_lock is aquired with softirqs disabled, >>> but does not itself disable softirqs, which can in rare circumstances >>> lead to a deadlock. >>> >>> Does this fix it? >> If so, drivers/net/hamradio.c, function sp_get() would probably need the >> equivalent fix. Same for drivers/net/ppp_async.c:ap_get() and sp_get() in >> drivers/net/ppp_synctty.c. > It seems that ppp_synctty.c is ok, it uses write_lock_irq() already, > sixpack.c looks like it has the same bug as mkiss. I also realized > after sending out the patch that only the write_lock needs to be > changed to write_lock_bh, while read_lock can leave softirqs enabled > because it can be called recursively. > > Arnd
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