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- Suppress compiler optimization so that orb[1] must be written first.

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We may need an explicit memory barrier for other architectures other than i386/amd64.

MFC after: 3 days
This commit is contained in:
Hidetoshi Shimokawa 2007-06-14 12:52:13 +00:00
parent 504e00af6b
commit 9b33b1ab38
1 changed files with 7 additions and 2 deletions
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9
sys/dev/firewire/sbp.c
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@ -2829,8 +2829,13 @@ SBP_DEBUG(2)
(uintmax_t)prev2->bus_addr, (uintmax_t)ocb->bus_addr);
#endif
END_DEBUG
prev2->orb[1] = htonl(ocb->bus_addr);
prev2->orb[0] = 0;
/*
* Suppress compiler optimization so that orb[1] must be written first.
* XXX We may need an explicit memory barrier for other architectures
* other than i386/amd64.
*/
*(volatile uint32_t *)&prev2->orb[1] = htonl(ocb->bus_addr);
*(volatile uint32_t *)&prev2->orb[0] = 0;
}
splx(s);