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Fix ram session quota accounting in lan9118

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This driver manually checks if the RAM quota is big enough for the
Lan9118 nic session component. The problem is Root_component::_create
from which Root_component::_create_session gets called does already
check this. No need to account for it twice.

Fixes #3514
This commit is contained in:
Piotr Tworek 2019-10-05 22:05:38 +02:00 committed by Christian Helmuth
parent 022fac0d37
commit 80a84bef26
1 changed files with 2 additions and 7 deletions
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9
repos/os/src/drivers/nic/lan9118/main.cc
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@ -63,19 +63,14 @@ class Root : public Genode::Root_component<Lan9118, Genode::Single_client>
size_t tx_buf_size = Arg_string::find_arg(args, "tx_buf_size").ulong_value(0);
size_t rx_buf_size = Arg_string::find_arg(args, "rx_buf_size").ulong_value(0);
/* deplete ram quota by the memory needed for the session structure */
size_t session_size = max(4096UL, (unsigned long)sizeof(Lan9118));
if (ram_quota < session_size)
throw Genode::Insufficient_ram_quota();
/*
* Check if donated ram quota suffices for both communication
* buffers and check for overflow
*/
if (tx_buf_size + rx_buf_size < tx_buf_size ||
tx_buf_size + rx_buf_size > ram_quota - session_size) {
tx_buf_size + rx_buf_size > ram_quota) {
error("insufficient 'ram_quota', got ", ram_quota, ", "
"need ", tx_buf_size + rx_buf_size + session_size);
"need ", tx_buf_size + rx_buf_size);
throw Genode::Insufficient_ram_quota();
}