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authorDavid Flater <dave@flaterco.com>2012-08-28 06:25:21 +0400
committerTakashi Iwai <tiwai@suse.de>2012-08-28 21:58:12 +0400
commit1338fc97d07a04e74a7b75ff28b7751061f4cf38 (patch)
treea9432867f53befa3ce1e63a11144b8ff4b5b6887 /sound/usb/card.h
parenta184d4e4591bb53fd8b91d6e8b85cffa261fb83e (diff)
downloadlinux-1338fc97d07a04e74a7b75ff28b7751061f4cf38.tar.xz
ALSA: emu8000: fix emu8000 DRAM sized 512 KiB too small
v2: Fixed result still wrong in the case of 512 KiB DRAM. Oops. Applicable to 3.5.3 mainline. In emu8000.c, size_dram determines the amount of memory on the sound card by doing write/readback tests starting at 512 KiB and incrementing by 512 KiB. On success, detected_size is updated to the successful address and testing continues. On failure, the loop is immediately exited. The resulting detected_size is 512 KiB too small except in two special cases: 1. If there is no memory, the initial 0 value of detected_size is used, which is correct. 2. If the address space wraps around, detected_size is updated before the bailout, so the result is correct. The patch corrects all cases and was tested with an AWE64 Gold. Before: EMU8000 [0x620]: 3584 Kb on-board memory detected asfxload 4GMGSMT.SF2 (4174814 B) fails. After: EMU8000 [0x620]: 4096 Kb on-board memory detected asfxload 4GMGSMT.SF2 succeeds. I do not have a card with 512 KiB to test with, but by forcibly enabling the added conditional I verified on the AWE64 Gold that it detects 512 KiB (successfully reading from the first memory location) and does not hang the card. C.f. Bug 46451 https://bugzilla.kernel.org/show_bug.cgi?id=46451 Signed-off-by: David Flater <dave@flaterco.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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