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01365633bd
The main arcnet interrupt handler calls arcnet_close() then
arcnet_open(), if the RESET status flag is encountered.
This is invalid:
1) In general, interrupt handlers should never call ->ndo_stop() and
->ndo_open() functions. They are usually full of blocking calls and
other methods that are expected to be called only from drivers
init and exit code paths.
2) arcnet_close() contains a del_timer_sync(). If the irq handler
interrupts the to-be-deleted timer, del_timer_sync() will just loop
forever.
3) arcnet_close() also calls tasklet_kill(), which has a warning if
called from irq context.
4) For device reset, the sequence "arcnet_close(); arcnet_open();" is
not complete. Some children arcnet drivers have special init/exit
code sequences, which then embed a call to arcnet_open() and
arcnet_close() accordingly. Check drivers/net/arcnet/com20020.c.
Run the device RESET sequence from a scheduled workqueue instead.
Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20210128194802.727770-1-a.darwish@linutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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|---|---|---|
| .. | ||
| arc-rawmode.c | ||
| arc-rimi.c | ||
| arcdevice.h | ||
| arcnet.c | ||
| capmode.c | ||
| com90io.c | ||
| com90xx.c | ||
| com9026.h | ||
| com20020-isa.c | ||
| com20020-pci.c | ||
| com20020.c | ||
| com20020.h | ||
| com20020_cs.c | ||
| Kconfig | ||
| Makefile | ||
| rfc1051.c | ||
| rfc1201.c | ||