4b7e76b9d8
[ Upstream commit 15319a4e8ee4b098118591c6ccbd17237f841613 ]
As &card->tx_queue_lock is acquired under softirq context along the
following call chain from solos_bh(), other acquisition of the same
lock inside process context should disable at least bh to avoid double
lock.
<deadlock #2>
pclose()
--> spin_lock(&card->tx_queue_lock)
<interrupt>
--> solos_bh()
--> fpga_tx()
--> spin_lock(&card->tx_queue_lock)
This flaw was found by an experimental static analysis tool I am
developing for irq-related deadlock.
To prevent the potential deadlock, the patch uses spin_lock_bh()
on &card->tx_queue_lock under process context code consistently to
prevent the possible deadlock scenario.
Fixes:
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|---|---|---|
| .. | ||
| .gitignore | ||
| adummy.c | ||
| ambassador.c | ||
| ambassador.h | ||
| atmtcp.c | ||
| eni.c | ||
| eni.h | ||
| firestream.c | ||
| firestream.h | ||
| fore200e.c | ||
| fore200e.h | ||
| he.c | ||
| he.h | ||
| horizon.c | ||
| horizon.h | ||
| idt77105.c | ||
| idt77105.h | ||
| idt77252.c | ||
| idt77252.h | ||
| idt77252_tables.h | ||
| iphase.c | ||
| iphase.h | ||
| Kconfig | ||
| lanai.c | ||
| Makefile | ||
| midway.h | ||
| nicstar.c | ||
| nicstar.h | ||
| nicstarmac.c | ||
| nicstarmac.copyright | ||
| solos-attrlist.c | ||
| solos-pci.c | ||
| suni.c | ||
| suni.h | ||
| tonga.h | ||
| uPD98401.h | ||
| uPD98402.c | ||
| uPD98402.h | ||
| zatm.c | ||
| zatm.h | ||
| zeprom.h | ||