From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [1/6] dma: tegra: avoid overflow of byte tracking From: Ben Dooks Message-Id: <20181031160309.20408-2-ben.dooks@codethink.co.uk> Date: Wed, 31 Oct 2018 16:03:04 +0000 To: dan.j.williams@intel.com, vkoul@kernel.org Cc: ldewangan@nvidia.com, dmaengine@vger.kernel.org, linux-tegra@vger.kernel.org, Ben Dooks List-ID: VGhlIGRtYV9kZXNjLT5ieXRlc190cmFuc2ZlcnJlZCBjb3VudGVyIHRyYWNrcyB0aGUgbnVtYmVy IG9mIGJ5dGVzCm1vdmVkIGJ5IHRoZSBETUEgY2hhbm5lbC4gVGhpcyBpcyB0aGVuIHVzZWQgdG8g Y2FsY3VsYXRlIHRoZSBpbmZvcm1hdGlvbgpwYXNzZWQgYmFjayBpbiB0aGUgaW4gdGhlIHRlZ3Jh X2RtYV90eF9zdGF0dXMgY2FsbGJhY2ssIHdoaWNoIGlzIHVzdWFsbHkKZmluZS4KCldoZW4gdGhl IERNQSBjaGFubmVsIGlzIGNvbmZpZ3VyZWQgYXMgY29udGlub3VzLCB0aGVuIHRoZSBieXRlc190 cmFuc2ZlcnJlZApjb3VudGVyIHdpbGwgaW5jcmVhc2Ugb3ZlciB0aW1lIGFuZCBldmVudHVhbGx5 IG92ZXJmbG93IHRvIGJlY29tZSBuZWdhdGl2ZQpzbyB0aGUgcmVzaWR1ZSBjb3VudCB3aWxsIGJl Y29tZSBpbnZhbGlkIGFuZCB0aGUgQUxTQSBzb3VuZC1kbWEgY29kZSB3aWxsCnJlcG9ydCBpbnZh bGlkIGhhcmR3YXJlIHBvaW50ZXIgdmFsdWVzIHRvIHRoZSBhcHBsaWNhdGlvbi4gVGhpcyByZXN1 bHRzIGluCnNvbWUgdXNlcnMgYmVjb21pbmcgY29uZnVzZWQgYWJvdXQgdGhlIHBsYXlvdXQgcG9z aXRpb24gYW5kIHB1dHRpbmcgYXVkaW8KZGF0YSBpbiB0aGUgd3JvbmcgcGxhY2UuCgpUbyBmaXgg dGhpcyBpc3N1ZSwgYWx3YXlzIGVuc3VyZSB0aGUgYnl0ZXNfdHJhbnNmZXJyZWQgZmllbGQgaXMg bW9kdWxvIHRoZQpzaXplIG9mIHRoZSByZXF1ZXN0LiBXZSBvbmx5IGRvIHRoaXMgZm9yIHRoZSBj YXNlIG9mIHRoZSBjeWNsaWMgdHJhbnNmZXIKZG9uZSBJU1IgYXMgYW55b25lIGF0dGVtcHRpbmcg dG8gbW92ZSAyR2lCIG9mIERNQSBkYXRhIGluIG9uZSB0cmFuc2ZlcgppcyB1bmxpa2VseS4KCk5v dGUsIHdlIGRvbid0IGZpeCB0aGUgaXNzdWUgdGhhdCB3ZSBzaG91bGQgL25ldmVyLyB0cmFuc2Zl ciBhIG5lZ2F0aXZlCm51bWJlciBvZiBieXRlcyBzbyB3ZSBjb3VsZCBtYWtlIHRob3NlIGZpZWxk cyB1bnNpZ25lZC4KClNpZ25lZC1vZmYtYnk6IEJlbiBEb29rcyA8YmVuLmRvb2tzQGNvZGV0aGlu ay5jby51az4KLS0tCiBkcml2ZXJzL2RtYS90ZWdyYTIwLWFwYi1kbWEuYyB8IDUgKysrKy0KIDEg ZmlsZSBjaGFuZ2VkLCA0IGluc2VydGlvbnMoKyksIDEgZGVsZXRpb24oLSkKCmRpZmYgLS1naXQg YS9kcml2ZXJzL2RtYS90ZWdyYTIwLWFwYi1kbWEuYyBiL2RyaXZlcnMvZG1hL3RlZ3JhMjAtYXBi LWRtYS5jCmluZGV4IDlhNTU4ZTMwYzQ2MS4uODIxOWFiODhhNTA3IDEwMDY0NAotLS0gYS9kcml2 ZXJzL2RtYS90ZWdyYTIwLWFwYi1kbWEuYworKysgYi9kcml2ZXJzL2RtYS90ZWdyYTIwLWFwYi1k bWEuYwpAQCAtNjM2LDcgKzYzNiwxMCBAQCBzdGF0aWMgdm9pZCBoYW5kbGVfY29udF9zbmdsX2N5 Y2xlX2RtYV9kb25lKHN0cnVjdCB0ZWdyYV9kbWFfY2hhbm5lbCAqdGRjLAogCiAJc2dyZXEgPSBs aXN0X2ZpcnN0X2VudHJ5KCZ0ZGMtPnBlbmRpbmdfc2dfcmVxLCB0eXBlb2YoKnNncmVxKSwgbm9k ZSk7CiAJZG1hX2Rlc2MgPSBzZ3JlcS0+ZG1hX2Rlc2M7Ci0JZG1hX2Rlc2MtPmJ5dGVzX3RyYW5z ZmVycmVkICs9IHNncmVxLT5yZXFfbGVuOworCS8qIGlmIHdlIGRtYSBmb3IgbG9uZyBlbm91Z2gg dGhlIHRyYW5zZmVyIGNvdW50IHdpbGwgd3JhcCAqLworCWRtYV9kZXNjLT5ieXRlc190cmFuc2Zl cnJlZCA9CisJCShkbWFfZGVzYy0+Ynl0ZXNfdHJhbnNmZXJyZWQgKyBzZ3JlcS0+cmVxX2xlbikg JQorCQlkbWFfZGVzYy0+Ynl0ZXNfcmVxdWVzdGVkOwogCiAJLyogQ2FsbGJhY2sgbmVlZCB0byBi ZSBjYWxsICovCiAJaWYgKCFkbWFfZGVzYy0+Y2JfY291bnQpCg==