/* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright © 2007 Nokia Corporation. All rights reserved. * Copyright © 2004-2010 David Woodhouse * * Created by Richard Purdie * * For licensing information, see the file 'LICENCE' in this directory. * */ #include #include #include #include #include #include "compr.h" static void *lzo_mem; static void *lzo_compress_buf; static DEFINE_MUTEX(deflate_mutex); /* for lzo_mem and lzo_compress_buf */ static void free_workspace(void) { vfree(lzo_mem); vfree(lzo_compress_buf); } static int __init alloc_workspace(void) { lzo_mem = vmalloc(LZO1X_MEM_COMPRESS); lzo_compress_buf = vmalloc(lzo1x_worst_compress(PAGE_SIZE)); if (!lzo_mem || !lzo_compress_buf) { free_workspace(); return -ENOMEM; } return 0; } static int jffs2_lzo_compress(unsigned char *data_in, unsigned char *cpage_out, uint32_t *sourcelen, uint32_t *dstlen) { size_t compress_size; int ret; mutex_lock(&deflate_mutex); ret = lzo1x_1_compress(data_in, *sourcelen, lzo_compress_buf, &compress_size, lzo_mem); if (ret != LZO_E_OK) goto fail; if (compress_size > *dstlen) goto fail; memcpy(cpage_out, lzo_compress_buf, compress_size); mutex_unlock(&deflate_mutex); *dstlen = compress_size; return 0; fail: mutex_unlock(&deflate_mutex); return -1; } static int jffs2_lzo_decompress(unsigned char *data_in, unsigned char *cpage_out, uint32_t srclen, uint32_t destlen) { size_t dl = destlen; int ret; ret = lzo1x_decompress_safe(data_in, srclen, cpage_out, &dl); if (ret != LZO_E_OK || dl != destlen) return -1; return 0; } static struct jffs2_compressor jffs2_lzo_comp = { .priority = JFFS2_LZO_PRIORITY, .name = "lzo", .compr = JFFS2_COMPR_LZO, .compress = &jffs2_lzo_compress, .decompress = &jffs2_lzo_decompress, .disabled = 0, }; int __init jffs2_lzo_init(void) { int ret; ret = alloc_workspace(); if (ret < 0) return ret; ret = jffs2_register_compressor(&jffs2_lzo_comp); if (ret) free_workspace(); return ret; } void jffs2_lzo_exit(void) { jffs2_unregister_compressor(&jffs2_lzo_comp); free_workspace(); } 80552fe508c'>diff
path: root/sound/soc/intel/baytrail/sst-baytrail-dsp.c
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /sound/soc/intel/baytrail/sst-baytrail-dsp.c
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/soc/intel/baytrail/sst-baytrail-dsp.c')